Re: Serialization of arrays - C# Discussion Boards

23-Jul-07 5:02

dilucidate wrote:
I am not sure I understand you.

dilucidate wrote:
What do you mean by it being a blocking method?

dilucidate wrote:
I am new to threading

dilucidate wrote:
I don't understand why you think my design doesn't make sense.

Text messages are not a good format for discussing a topic as complex as threading. There are good resources available for developers that want to "understand" how and why to properly use threads. An old book that I found very useful was Advanced Windows by Jeffery Richter. Also I have seen several people give a link to a web site with a threading tutorial. Perhaps Google can find it for you.

dilucidate wrote:
I am new to threading and am actually just using a BackgroundWorker to make it easier.

"Easier" is not how I would describe your code. Have you ever heard of the K.I.S.S. principle? It means Keep It Simple Stupid.

Focusable Panel

Sukhjinder_K20-Jul-07 7:14

Sukhjinder_K

20-Jul-07 7:14

Please suggest me proper method to make my Panel recieve Input Focus.
My Requirement is that I have 2 buttons, followed by a Panel and then a List.
I should be able to transfer the focus from First Btn, 2nd Btn, Then Panel and finally the ListBox. Everything is fine but I cannot get the Panel to recieve Keyboard Focus.

I'm using .NET 2.0 SDK.

Thanks

PS: I know that .NET 3.0 has Control.Focusable Property

Re: Focusable Panel

Judah Gabriel Himango20-Jul-07 7:29

Judah Gabriel Himango

20-Jul-07 7:29

Try deriving a control from Panel, and in the constructor, call base.SetStyle(ControlStyles.Selectable, true).

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: How could God prove Himself to humanity?
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Re: Focusable Panel

Sukhjinder_K20-Jul-07 7:39

Sukhjinder_K

20-Jul-07 7:39

Thanks Judah Himango Works As Expected.

Serialization of arrays

Rudolf Jan20-Jul-07 7:05

20-Jul-07 7:05

I want to serialize an array of objects, using the SOAP formatter. However, when serializing the second object, I get an exception that says I cannot add the same object twice to a serialization info. I wrote a small application to demonstrate the problem:

using System;
using System.IO;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Serialization;
using System.Xml;
using System.Runtime.Serialization.Formatters.Soap;

namespace Serialization
	{
	// Create a class to include in the list
	[Serializable]
	public class MyObject:ISerializable
		{
		public Int32 idx=0;

		public MyObject(Int32 i)
			{
			idx=i;
			}

		public virtual void GetObjectData(SerializationInfo info,StreamingContext context)
			{
			info.AddValue("Idx",idx);
			}
		}

	// The objectlist consists of a list of MyObjects
	[Serializable]
	class ObjectList: ISerializable
		{
		public List<MyObject> TheList;

		public ObjectList()
			{
			TheList=new List<MyObject>(10);
			MyObject tmp=new MyObject(1);
			TheList.Add(tmp);
			tmp=new MyObject(2);
			TheList.Add(tmp);
			}

		public virtual void GetObjectData(SerializationInfo info,StreamingContext context)
			{
			Int32 i=0;

			for(i=0;i<2;i++)
				{
				if(TheList[i]!=null)
					{
					// Serialize a MyObject contained in TheList
					// This does not work for the second occurrence of MyObject
					TheList[i].GetObjectData(info,context);
					}
				}
			}
		}

	class Program
		{
		static void Main(string[] args)
			{
			ObjectList MyObjectList=new ObjectList();
			FileStream WriteStream=new FileStream("test.xml",FileMode.Create); 
			SoapFormatter bfor=new SoapFormatter();
			bfor.Serialize(WriteStream,MyObjectList);
			}
		}
	}

In the sample I create a class MyObject. Objects of type MyObject are stored in an ObjectList object, which essentially is a wrapper around a LIST<myobject> generic List object.

I have no idea what I'm doing wrong. I did not find any samples on how to handle array serialization. Please note that the application I develop is far more complex than this. Therefore I do not want to use automatic serialization. I use the SOAP formatter because it is easier to debug. Later I will switch to the binary formatter.

Tanks in advance for your advice.

Rudolf Heijink

led mike20-Jul-07 7:14

20-Jul-07 7:14

Rudolf Jan Heijink wrote:
ObjectList MyObjectList=new ObjectList();

try this:

List<MyObject> list = new List<MyObject>();<br />
// now add the items to the list<br />
//<br />
bfor.Serialize(WriteStream, list);<br />

Rudolf Jan23-Jul-07 2:56

23-Jul-07 2:56

Thank you very much for your suggestion.

Unfortunately, your suggestion does not work with the SOAP formmatter. The SOAP formatter seems not to support generic types. With the Binary formatter it seems to work, at least no exceptions or error messages.

Still, I do not like it. I still think it is quite normal to serialize a number of objects. Another thing is that you should not invoke the Soap formatter more than once, because it generates XML headers. (i tried to do this)

I also think there is a difference betwee a class containing al List and maybe other objects (as I will need in my application) and a list. So, I'm not happy yet. Thanks anway.

Rudolf Heijink

Rudolf Jan23-Jul-07 8:03

23-Jul-07 8:03

I did some additional tests. It seems the problem has nothing to do with lists, but possibly there is a bug in .NET. If I try to serialize two objects of the same type, I get the error message that I cannot serialize the same object twice. It mey be an error in the translation of the .NET error messages. I cannot check that. I have a Dutch Windows version trepresenting all .NET errors in Dutch.

Below the code to demonstrate the problem:

using System;
using System.IO;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Serialization;
using System.Xml;
using System.Runtime.Serialization.Formatters.Soap;

namespace Serialization
	{
	// Create a class to include in the list
	[Serializable]
	public class MyObject:ISerializable
		{
		public Int32 idx=0;

		public MyObject(Int32 i)
			{
			idx=i;
			}

		internal MyObject(SerializationInfo info,StreamingContext context)
			{
			idx=info.GetInt32("Idx");
			}

		public virtual void GetObjectData(SerializationInfo info,StreamingContext context)
			{
			info.AddValue("Idx",idx);
			}
		}

	[Serializable]
	class ObjectList: ISerializable
		{
		MyObject object1;
		MyObject object2;

		public ObjectList()
			{
			object1=new MyObject(1);
			object2=new MyObject(2);
			}

		protected ObjectList(SerializationInfo info,StreamingContext context)
			{
			object1=new MyObject(info,context);
			object2=new MyObject(info,context);
			}

		public virtual void GetObjectData(SerializationInfo info,StreamingContext context)
			{
			object1.GetObjectData(info,context);
			// here (netx statement) i get an exception, cmplaining i cannot serialize 
			//the same object twice, though the objects are clearly not the same.
			object2.GetObjectData(info,context);
			}
		}

	class Program
		{
		static void Main(string[] args)
			{
			ObjectList MyObjectList=new ObjectList();
			FileStream WriteStream=new FileStream("test.xml",FileMode.Create); 
			SoapFormatter bfor=new SoapFormatter();
			MyObject Object1=new MyObject(1);
			MyObject object2=new MyObject(2);
			bfor.Serialize(WriteStream,MyObjectList);
			}
		}
	}

Rudolf Heijink

led mike23-Jul-07 8:23

http://weblogs.asp.net/fbouma/archive/2005/12/12/432971.aspx[^]

23-Jul-07 8:23

Rudolf Jan5-Aug-07 10:07

Showing form window above task bar.

5-Aug-07 10:07

Sad story,

I think I understand much more now why things went wrong in my application. I will write an article about it for codeproject, so coming soon.

Thanks anyway for your help.

Rudolf Heijinbk

kaleem tarar20-Jul-07 6:48

kaleem tarar

20-Jul-07 6:48

how do i program a form window (in c#) to come above the taskbar when ControlBox property is set to false as it slides under the taskbar.

How to install an addin for Visual Studio .NET 2005

imagic20-Jul-07 6:35

imagic

20-Jul-07 6:35

Hi all,
I has just create an add-in for Visual Studio .NET 2005. I want to create an setup for that add-in so that I can share it to my friends. But I don't know how to do it. Please help me.

Thanks a lot.

imagic

Re: How to install an addin for Visual Studio .NET 2005

Judah Gabriel Himango20-Jul-07 7:31

Judah Gabriel Himango

20-Jul-07 7:31

This article[^] talks about creating an add-in for VS as well as creating a setup project for the add-in, allowing it to be installed on other machines with Visual Studio.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: How could God prove Himself to humanity?
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Re: How to install an addin for Visual Studio .NET 2005

imagic20-Jul-07 18:53

imagic

20-Jul-07 18:53

Thanks a lot.
But I have a problem at Figure 5 (Miscellaneous options for the add-in). In Visual Studio 2005, I can't find "Setting up access privileges" in Add-in Wizard (Page 4 of 6).
Please help me.

Thanks lots.

imagic

Re: How to install an addin for Visual Studio .NET 2005

imagic20-Jul-07 22:49

imagic

20-Jul-07 22:49

Oh yeah, just create a setup project and modify registry. I done Smile | :)

. Thx you.

imagic

Replacing pictures

eskape1920-Jul-07 5:30

eskape19

20-Jul-07 5:30

I have a set of images in a window, each loaded in a panel.
I am trying to replace them one by one with new pictures, this way: clicking on a picture in order to open a browse window from where I then choose the replacement.

My problem is that I can't finalize the operation as I get the error "The process cannot access the file '...' because it is being used by another process." This is because I am trying to change the source that started the click event!

How can I play a trick on in to make it work?

P.S. I should also mention that in the click event I am using the File.Copy(source, destination, true) method.

Good gives us the power of creating the future. Use this power with reason.

Re: Replacing pictures

Luc Pattyn20-Jul-07 5:56

Luc Pattyn

20-Jul-07 5:56

Hi,

maybe this is the problem: Image class keeps the file open when you somehow load the
image from file (I guess because that way they dont have to load all the metadata until
it is really needed).

The way to circumvent that is by using an intermediate image, like so (approx):

Bitmap image1=Image.FromFile(filename);
Bitmap image2=new Bitmap(image1);
image1.Dispose();
// now do with image2 whatever you like, file is no longer locked

Hope this helps.

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Upload a file to my server

Raymond_P*20-Jul-07 5:07

Raymond_P*

20-Jul-07 5:07

Hi im making an app for myself so i dont need any security , Basicly i have a mirror copy of my server on my harddisk , and a xml file that my application edits .

E:\\Remote Server\\Site Data\\Instent Alerts\\Status.xml

So what id like to do is take that file and upload it onto my server to Site Data\\Instent Alerts\\Status.xml.

Its not a public server therfore ill need to use my username and password but i cant find any examples with this online

Can anyone help me out

led mike20-Jul-07 7:04

20-Jul-07 7:04

Raymond_P* wrote:
i dont need any security

Why aren't you using FTP?

Raymond_P*20-Jul-07 7:08

Raymond_P*

20-Jul-07 7:08

Thhats what i ment , i want to fund a way of uploading the file overwriting the old one using FTP .

But all the examples ive seen are for annonimus access i need to use my username and pass .

I wont be giving ths to anyone else so its ok to intagrate tjhe username and pass in the app

led mike20-Jul-07 7:11

20-Jul-07 7:11

Raymond_P* wrote:
i dont need any security

Raymond_P* wrote:
i need to use my username and pass .

Raymond, I'm pretty sure a requirement to use a login and password qualifies as "needing security". Confused | :confused:

Raymond_P*20-Jul-07 7:33

Raymond_P*

20-Jul-07 7:33

i ment its ok for me to put my username and pass into the application i wont be handing it out to anyone .

I just need to upload and overwrite a single file , any ideas ?

led mike20-Jul-07 8:01